Your comment implies that micrometers and thous aren't an order of magnitude different. Regardless of which one you are talking about small tilts are not going

Your comment implies that micrometers and thous aren't an order of magnitude different. Regardless of which one you are talking about small tilts are not going to make a big difference. As long as everything is lined up properly within the machine then you aren't going to have a problem. Hell, even if it is a horrible, cheap, backlash ridden machine it is quite possible to machine something down to 1 thou tolerance provided you are careful and know a few tricks. I'm not even trained as a machinist and I have done that without too much trouble.